Carburetor



A. E. WEAVER A Nov. 8, 1927.

GRBURETOR.

2 Sheets-Sheet l Filed Sept. 5. 1921 /l//llllllgll fl IJ;

DvmwM/Lm Abe'rtEWeauer Nov.. 8, 1927. 1,648,087

A. E. WEAVER CARBURETGB Filed Sept, 5, 1921 2 Sheets-Sheet 2 SHARM hw, A1 bert Eweaver Patented Nov. 8, 1927.

" UNITED; stares ALBERT E.y WEAVER, OF INDIANAPOLIS, INDIANA., ASSIGNOR, BY'AMESNE ASSIGN- tenei ur omer.

MENTS, fI'O IRA T. SWARIZ, TRUSTEE, OF INDIANAPOLIS, INDIANA.

CAR-BURETOR.

Application led vSelfteinber 3, 1921. `Serial No. 498,335.

This invention relates to carburetors, and one feature of the invention 1s the provision of means for introducing air `into the fuel chamber of the carburetor at a point below 5f the float for aerating the fuel and agitating f thefloat .and imparting thereto a incre sensitive action, and providing a positive action for the float in the event of the increase of vacuunrabove the float. i n A furtherfeature of the inventionis. the yprovision of achaniber having an Vautomatic valve therein which automatically closesrron` `the stopping of theengine., and preventsk f haclrlire` throughlthe chamber. i

provision of iueansfor introducing air into the fuel mixture at such time asfthe motor 'is running at low speed or is idling.

A .further feature of the invention is the provision of ineansfor breaking up any globules that may be formed in the fuel f prior to discharging the saine into vthe ven turi of the carburetor.

A further feature of the invention is. the

" provision of means for collecting any globl ules 'that may be formed in passing the air through the fuel surrounding ,the` accelerating chamber, and `preventing said globules :from being discharged with the air through 3 the venturi.

`. terminating the tube entering the venturi in `line with ports, `arranged transversely through the walls of the vent-uri in the re- 3 `striicted portion of the throat thereof.,

. A further feature of the invention is the provision of a two-point suspension for `the float, together with yielding means for regulating the fuel feed opening frein the bowl 40 of the carburetor to the air chamber.

A further feature of the invention is the provision of an air valve vso constructed as to haveisubstantially a dash pot action.

, Other objects and advantages will be hereinafter more fully set forth and pointed out in the accompanying specification.

Referring to the drawings,

Figure 1 isa vertical central sectional View through the carburetor, c

Figure 2 2 2, Fig. 1, y

` Figure 3 is a view similar to Figure 2 as seen on line 3 3, Fig. 1,

A further feature of the invention is theV A further feature ofthe invention is inv is a vhorizontal sectionfon linel lFigure 4 is an enlarged detail sectional 2view showing the manner of regulating the admission of air while the engine is idling,

Figure 5 is an end elevation thereof, Figure Gis an edge elevation thereof, and Figure r'iisa detail top plan View rofan agitating n'ioans for the float.

Referring to the drawings, 1 indicates the rbowl of the carburetor and 2 indicates the deine therefor, the upper edge of the bowl 1 having a flange 3 into which the freeedge of thcidonie extends, a shoulder et being pro-` vided in the interioriof the bowl 1 against winch the end of the dome rests when the tivo parts are vproperly connected together.

kExtending through one wall of the bowl 1 is an air passage 5 which terminates at its outer `end in a right angular extension 6, and "through which heated air is conveyed into the interior of the carburetor.

The air passage `5 is provided with adischarge endl?, while depending from the 'crown portion of the doine 2 is an alined element 8, both of which are interiorly ythreaded to receive the threaded ends of a r,connecting tube 9, saidtube serving to lock c retor. In the upper portion of the connecting f tube 9 is a venturi 14 which has horizontally extending ports 15 `which are preferably located in the niost restricted or throat portion of the venturi, and substantially in alignnient with theupper end ofthe tubey 11,

1 the ports 15 alsov extending through the wall ofthe tube 9, so that the vapor may enter from the bowl of the carburetor and be cornmingled with theair and fuel discharging rinto the venturi from the air passage 5 and V tubev 11'. i

rlihe tube 11 is provided primarily for supplying the `fuel 4when the engine 1s running at low speed or idling, under which circumstances the supply of air is not suilicientto properly reduce the richness of the mixture, a secondary passage 16 being provided in the carburetor with which the lower end of the tube 11 connects, and communicating with said passage is an air-control 17 comprising a cup-shaped body 18, the closed end of which has a threaded extension 19 thereon for securing the air control to the wall 16 of the secondary passage 16, the' body por tion 18 being outside of the carburetor while the inner end of theextension 19 communicateswith the interior of the passage 16. This air control 17 may be connected to the air passage 16 in any desired manner but preferably with' the threaded extension 19 threaded through the side wall of the passage to form communication therewith.

Rotata-bly mountedv within thev body 18 is a' Y valve 20 through which is form-ed a port 21 for co-operation with a port 22 extending longitudinally through the threaded extension 19, the ports 21 and 22 being formed at an angle 4to the axis of the valve 20 and extension 19, so that when the valve 2O is rotated the port 21 will move into or out of registration with the end of the port 22, so

that thej amount of air passing through said ports may be readily increased or decreased, or entirely cut off, as may be desired. The valve 20 may be retainedY Within the cupp shaped body 18 in any suitable manner as by introducing pins 23 through the outer edges of the body 18, the inner ends of the pins ex- 11, the section of the gauze being such as to l thoroughly atomize, the particles passing p'lalythrough a'pipe`25fthe end ofthe pipe' Yftur'n threaded throughthe wall of thebowl *'1, the' tap having-a port 27 therethrough for f the'passage of the gasoline. 'Y

therethrough. A The fuel, preferably gasoline, is 'conveyed from any suitable source of sup- 25`bein'g threaded into atap 26, whichisin `ATlieflo ofthe gasoline through the port j 27 isicon'trolled lby a'iioat valve r28, the stem "29 of which passes throughfanextension 30 flo' ofa float' yoke 31, and immediately above the extension 30 'is provided with a'ball 32Go that'thevalve may" have `slight pendulum or 1 swinging action 'for causing the valve to more uniformly seat.A The yoke 31 is'prefer- A-iziblvconstructed?of"sheet1metal and has' ltonguesy 33 'struck therefrom, which tongues are so bent as to form bearings for engagement with a pivot rod 34, the ends of said rod being mounted in parts of the walls of the carburetor, consequently the yoke will be given a two-point suspension, so that the ffioat 35 connected with the bifurcated ends of the yoke will positively rest in a horizontal position at all times.

' To prevent agitation of the valve 28, due to any bobbing action of the float 35, one end of a' spring arm 36k is attached to one scction of the yoke 31, and preferably on the opposite side of the pivot lrod 34 from the valve stem 29, the opposite end of the arm 36 having a slot 37 through which that portion lof the stem 29 above the ball 32 passes, so thatv the free end of the spring arm 36 will rest upon and normaly direct pressure against the ball 32, the tension of the spring arm 36 being such as to prevent undue or uneven agi tationof the valve 28, consequently any unusual vibratory or bobbing movement of the loatwill not affect the operation of the Heat valve.

The float 35 is normally rraised and low ered by the action of the gasoline within the bowl of the carburetor. When the engine createsan undue amount of vacuum in the upper portion of the carburetor, as when the engine is first started, the suction through the pipe line 25 is so great that an over supply of gasoline will be drawn into the carburetor before the float acts to control the admission of the gasoline and causes a fluctuating action of the carburetor. To overcome this objectionable feature an agitating pipe 38 is entered through the bottom p0rtion of the bowl 1, and is connected with the right angular extension 6 of the air passage 5 through a by-pass 39, the upper end ofthe pipe 38 terminating below thc float 35 and preferably at the transverse center of the float, and if desired a hollow head is connected' with the upper end of the pipe 38 and curved co-incident to the curvature of the ioat so as to distribute the pressure of the air from the pipe 38 over a considerable surface of the fioat 35, the upper face of the head 40 having a plurality of perforiltiols 41 for the escape of the air from the By providing thisform of device thejsud-i" den increased speed of the motor will not affect tbe'uniform flow ofthe gasoline into the carburetor, asV the pressure` of the air which is directed through the by-pass 'and lpipe connected'therewith incident tothe opening of -thet-hrottle to increasethe speed of the engine, willgautomatically raise the float and'partially orv'fully yclose the float valve 28.

'llov'prevent rthe gasoline fromk flowing" 42 is placed in the pipe 38 adjacent the lower end thereof, the interior of the pipe 38 being provided with a seat 43, and when the ball 42 rests thereon completely closes the downward vpassage through the pipe 38. The ball 42 is limited in its upward movement by introducing a pin 44 through the walls of the pipe 38 and across the opening therein.

The movement of air through the air passage 5 is controlled by a valve 45 which co-operates with a seat 46 formed at the juncture of the right angular extension 6 with the main portion of the air passage 5, said valve having a stem 47 which enters a bore 48 in an adjusting bolt 49 which threads through a cap 50 which in turn threads into an opening in the wall of the air passage 5. The valve 45 is normally held in closed position by means of a. spring 5l which surrounds the stem 47 and has one end thereof pressing against the under face of the valve,

while the opposite end engages a shoulder 52 on the upper end of the projecting bolt 49, and by adjusting the bolt 49 lengthwise the tension of the spring 5l may be readily bore 4S on the upward movementof the valve 45, but will be held against rapid escape from the bore on the descent of the valve, consequently causing the air within the bore to cushion the movement of the valve. j

The air discharged from the pipe 38, in addition to elevating the float 35, when the vacuum is increased above the float, also serves in a degree to aerate the gasoline and when leaving the gasoline, tends to form bubbles which, if carried into the ports 15, would retard the proper action of the ven turi. In order to eliminate such bubbles as may be formed, a battle plate 55 is placed in the dome 2 at a point above the iioat and at a` point below the ports l5, the outer edge of the baffle plate fitting the interior of the dome while the axial center thereof is provided with an opening 56 for the passage of the tube 9, the opening 56 being preferably formed oblong to provide a passage 57 through which the air may escape from the fuel chamber. The baille plate 55 may be constructed of solid metal or may be formed of mesh wire, and in either instance the passageway 57 is located at the opposite side of the vertical axis of the carburetor from the pipe 38, consequently when the air leaves the fuel it will strike the baffle plate and be broken up before it escapes through the passage 57, consequently any drops of fuel carried up by the air will adhere to the under surface of the baffle plate and will eventually descend by gravity into the fuel oha-mber,`

thus discharging only the purified airand vaporinto the chamber above the baille plate.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is: y

l. In a carburetor construction, a bowl portion having a fuel chamber, a detachable dome cooperating therewith, means for connecting the dome with the bowl, a venturi associated with the dome portion of the carburetor having ports through the wall ythereof, a tube supported by the bowl having one of its ends entered in said venturi and terminating substantially in line with the horizontal axes of said ports, and an atomizing thimble introduced over the end of the tube entering the venturi. f

2. In a carburetor construction, a bowl portion forming a fuel chamber, a. dome above said bowl, means for locking the bowl and dome together, said means providing a main air passage through the fuel chamber, a! float pivotally mounted in the fuel chamber, a valve controlled by said float, a pipe for conveying air into the lower portion of the fuel chamber and discharging the same beneath and against the free end of said float, anda baffle plate having a passage therethrough at the opposite side of the main air passage from said pipe, the passage in said plate being positionedy for causing the air to travel over the under face of the baille plate for removing excess vapor before entering said passage.

3. A carburetor comprising a bowl vportion, a dome associated therewith, a tube for connecting said bowl with said dome the lower end of said tube connecting with an air passage, a. venturi in said tube adjacent the upper end thereof having ports therej through, a second tube axially of the first tubeand terminating Iin the throat portion of the venturi, a fuel nozzle extending into the opposite end of said second tube, means for controlling the passage of fuel through the nozzle, a. float in said bowl, means for conveying air into said bowl and against said float, means for controlling the passage of air into` said air passage communicating with the first tube, and means for regulating the admission of air into the second tube.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 12th day of August, A. D. nineteen hundred and 

